can I use higher octane on my car for better performance even though its stock?

Question

I have minor changes on my car for racing and I was wondering if 89 or 91 octane in my car would hurt it

2001 mits. mirage 1.8 w/ straight pipe magnaflow exhaust and performance intake manifold

mixing the two is ok as well right?

Answer 1

using a higher octane won't hurt the car. the big danger is running a car lean by using a lower octane which can cause detonation. Modern cars will generally adjust the timing to compensate for lean conditions though.
Performance gains going from 87 to 89 or 91 ocatane aren't going to be all that noticable.

Answer 2

Higher octane fuel will give the car a "little more" performance. High octane fuel ignites easier than lesser grades of fuel.
DO NOT put racing fuel into your car.
Most newer cars will have no noticeable change in performance. Most engines are running super lean (more air than fuel) to keep within emission standards and the programming will not allow the engine to do much better than it is allowed to.
If you have an older car with high miles (90K-over 100K) higher octane fuel WILL help it start and run cleaner.

Answer 3

replacing the compression ratio will do no longer some thing for MPG, it supplies you higher advantageous performance and require that you employ a higher octane gasoline yet that is about it, your coping with an previous heavy chassis with a carburated V8 engine, new truck manufactures get round this with lighter chassis and redesigned engines utilising ported gasoline injection, hell Ford is utilising direct injection on there Eco enhance, and those MPG numbers are fairly solid, they may well be onto some thing so assume the others to adhere to in good structure, so it is the way you do it, pull that previous engine out and container it up, placed it someplace secure in case you want to reinstall it at a later date, purchase your self a sparkling crate engine with port injection and the ECM that is going with it, many after market organization's promote the equipment waiting to position in, besides the undeniable fact that you'll nonetheless have weight as a controversy your MPG will dramatically advance.

Answer 4

You did not say what it was. Some cars and trucks MUST use regular as they higher octane will cause higher compression problems which they are not meant for. Learned this on TV program "60 minutes." and straight from the dealers mouth too.

Answer 5

No . higher octane gasoline will not help performance BUT it will help ur engine run alot smoother and quieter.
Basically the higher octane the more resistance to igniting and vice versa.
U DONT WONT UR GAS IGNITING TOO SOON THAT MAKES ENGINES KNOCK !!!!
HOPED THAT HELPED.

Answer 6

Won't hurt it. For performance modifications, higher octane is recommended.

Answer 7

it will not hurt and will not help the higher octane is more antidetonant .so if no false dettonations in your motor because high compression, tou dont need higher octane fuel.

Answer 8

Use 91 you will notice a difference immediately and it won't hurt a thing.

Answer 9

it's not a high performance engine your probably wasting your money, try it and see if it makes a difference and if you think it warrants using the high test do it.